2vaz

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[[Image:2vaz.gif|left|200px]]
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{{Seed}}
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[[Image:2vaz.png|left|200px]]
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{{STRUCTURE_2vaz| PDB=2vaz | SCENE= }}
{{STRUCTURE_2vaz| PDB=2vaz | SCENE= }}
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'''MODEL OF THE S15-MRNA COMPLEX FITTED INTO THE CRYO-EM MAP OF THE 70S ENTRAPMENT COMPLEX.'''
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===MODEL OF THE S15-MRNA COMPLEX FITTED INTO THE CRYO-EM MAP OF THE 70S ENTRAPMENT COMPLEX.===
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==Overview==
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Gene expression can be regulated at the level of initiation of protein biosynthesis via structural elements present at the 5' untranslated region of mRNAs. These folded mRNA segments may bind to the ribosome, thus blocking translation until the mRNA unfolds. Here, we report a series of cryo-electron microscopy snapshots of ribosomal complexes directly visualizing either the mRNA structure blocked by repressor protein S15 or the unfolded, active mRNA. In the stalled state, the folded mRNA prevents the start codon from reaching the peptidyl-tRNA (P) site inside the ribosome. Upon repressor release, the mRNA unfolds and moves into the mRNA channel allowing translation initiation. A comparative structure and sequence analysis suggests the existence of a universal stand-by site on the ribosome (the 30S platform) dedicated for binding regulatory 5' mRNA elements. Different types of mRNA structures may be accommodated during translation preinitiation and regulate gene expression by transiently stalling the ribosome.
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The line below this paragraph, {{ABSTRACT_PUBMED_17889647}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 17889647 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17889647}}
==About this Structure==
==About this Structure==
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[[Category: Rrna-binding]]
[[Category: Rrna-binding]]
[[Category: Translation initiation]]
[[Category: Translation initiation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 18:31:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 14:43:39 2008''

Revision as of 11:43, 29 July 2008

Image:2vaz.png

Template:STRUCTURE 2vaz

MODEL OF THE S15-MRNA COMPLEX FITTED INTO THE CRYO-EM MAP OF THE 70S ENTRAPMENT COMPLEX.

Template:ABSTRACT PUBMED 17889647

About this Structure

2VAZ is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structured mRNAs regulate translation initiation by binding to the platform of the ribosome., Marzi S, Myasnikov AG, Serganov A, Ehresmann C, Romby P, Yusupov M, Klaholz BP, Cell. 2007 Sep 21;130(6):1019-31. PMID:17889647

Page seeded by OCA on Tue Jul 29 14:43:39 2008

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